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Re: [Qemu-devel] Help with deadlock when using sound

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Help with deadlock when using sound
Date: Wed, 13 May 2015 15:56:04 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 13/05/2015 11:38, Peter Maydell wrote:
> then we'll turn on the error checking, and a double-unlock
> will result in a call to abort(). If you run QEMU under
> a debugger you'll get a backtrace which will tell you which
> code did the second unlock (and thus which mutex it is).
> (Linux has a similar attribute, though it is named
> PTHREAD_MUTEX_ERRORCHECK_NP; we might want to consider
> turning on mutex debugging for --enable-debug builds.)

We had it, but I had to disable it because it doesn't work (at all) when
you fork.  The PID changes under the code's feet and subsequent unlocks
do not like it.


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